<!DOCTYPE html>
<html>
	<head>
		<script>
			/*var greeting = "Welcome";
			console.log(window.greeting);  // Welcome
			
			console.log(window.Screen);  // function Screen() { [native code] }
			var Screen = "liquid crystal";
			console.log(window.Screen);  // liquid crystal*/
			
			let greeting = "Welcome";
			console.log(window.greeting);  // undefined
			
			const Screen = "liquid crystal";
			console.log(Screen === window.Screen);  // false
		</script>
	</head>
</html>